Nah... sorta.
Christie is a perennial candidate. He ain't got a single shot in hell of winning and everybody knows it.
He's in it for the microphone and the matching government funds.
But since he is in there, without a damn thing to lose, He can stalking-horse for someone else, and meet tit-for-tat in like fashion, trading blows at Tumpy's level, and probably paid to do it.
But even if for kicks, good for the goose is good for the gander. Just desserts.